package class01;

import java.util.Arrays;

/**
 * @author zhangchaoliang
 * create 2022
 */
public class b3 {
    public static void selectionSort(int[] arr) {
        if (arr == null || arr.length < 2)
            return;
        for (int i = 0; i < arr.length - 1; i++) {
            int minIndex = i;
            for (int j = i + 1; j < arr.length; j++) {
                minIndex = arr[minIndex] > arr[j] ? j : minIndex;
            }
            swap(arr, i, minIndex);
        }

    }

    public static void insertionSort(int[] arr) {
        if (arr == null || arr.length < 2)
            return;
        for (int i = 1; i < arr.length; i++) {
            for (int j = i - 1; j >= 0 && arr[j] > arr[j + 1]; j--)
                swap(arr, j + 1, j);
        }
    }

    public static void bubbleSort(int[] arr) {
        if (arr == null || arr.length < 2)
            return;
        for (int i = arr.length - 1; i > 0; i--) {
            for (int j = 0; j < i; j++) {
                if (arr[j] > arr[j + 1])
                    swap(arr, j, j + 1);
            }
        }
    }

    public static void comparation(int[] arr) {
        Arrays.sort(arr);
    }

    public static void swap(int[] arr, int i, int j) {
        int tmp = arr[i];
        arr[i] = arr[j];
        arr[j] = tmp;
    }

    public static int[] RandomArrays(int maxSize, int maxValue) {
        int[] arr = new int[(int) ((maxSize + 1) * Math.random())];
        for (int i = 0; i < arr.length; i++) {
            arr[i] = (int) ((maxValue + 1) * Math.random()) - (int) ((maxValue + 1) * Math.random());
        }
        return arr;
    }

    public static int[] copyArrays(int[] arr) {
        if (arr == null)
            return null;
        int[] arr1 = new int[arr.length];
        for (int i = 0; i < arr.length; i++) {
            arr1[i] = arr[i];
        }
        return arr1;
    }

    public static boolean isEqual(int[] arr1, int[] arr2) {
        if (arr1 == null && arr2 == null)
            return true;
        if ((arr1 == null && arr2 != null) || (arr1 != null && arr2 == null))
            return false;
        if (arr1.length != arr2.length)
            return false;
        for (int i = 0; i < arr1.length; i++) {
            if (arr1[i] != arr2[i])
                return false;
        }
        return true;
    }

    public static void printArrays(int[] arr) {
        if (arr == null)
            return;
        for (int i = 0; i < arr.length; i++)
            System.out.print(arr[i] + " ");
        System.out.println();
    }

    public static void main(String[] args) {
        int testTime = 500000;
        int maxSize = 100;
        int maxValue = 100;
        boolean succesed = true;

        for (int i = 0; i < testTime; i++) {
            int[] arr1 = RandomArrays(maxSize, maxValue);
            int[] arr2 = copyArrays(arr1);
            int[] arr3 = copyArrays(arr1);
            int[] arr4 = copyArrays(arr1);

            selectionSort(arr1);
            insertionSort(arr2);
            bubbleSort(arr3);
            comparation(arr4);

            if (!isEqual(arr1, arr4) || !isEqual(arr4, arr2) || !isEqual(arr3, arr4)) {
                succesed = false;
                printArrays(arr1);
                printArrays(arr2);
                printArrays(arr3);
                printArrays(arr4);
                break;
            }

        }

        System.out.println(succesed ? "成功！" : "失败！");
    }
}
